This study aims to improve the detection of pancreatic cancer coming back after surgery. Pancreatic ductal adenocarcinoma (PDAC) is a type of cancer that starts in the ducts of the pancreas. After surgery, there's a high chance the cancer might return. The study compares a new, organized plan to watch for cancer, using regular tests and scans, against the usual way, which is not as organized. This new plan uses blood tests (called tumor marker tests) and special X-rays (CT scans) to look for cancer signs every three months for two years after surgery. The goal is to see if this helps people live longer and feel better.

• Study involves regular testing every 3 months for two years.
• Participants must have had surgery for pancreatic cancer.
• Participation requires being part of specific existing studies.